[Bug 106175] amdgpu.dc=1 shows performance issues with Xorg compositors when moving windows

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=106175

            Bug ID: 106175
           Summary: amdgpu.dc=1 shows performance issues with Xorg
                    compositors when moving windows
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: tempel.julian at gmail.com

Created attachment 138987
  --> https://bugs.freedesktop.org/attachment.cgi?id=138987&action=edit
dmesg

When amdgpu.dc=1 and an Xorg compositor are enabled at the same time, there is
stuttering when moving windows.
It's most visible with Compton (which is completely stutter-free when
amdgpu.dc=0), but also KWin and to a lesser extent also Gnome-Mutter.
It happens also with GPU clocks forced to maximum, so it doesn't seem to be a
powersaving issue.
In the recent past, there was an issue with performance degrading when
amdgpu.dc=1 and an Xorg compositor are enabled and the hardware mouse cursor
was used, maybe it's still related (just guessing though)?

Tested with Linux 4.17 RC1 and drm-next-4.18-wip (4.16.1.52132fd03)
xorg-server 1.19.6+13+gd0d1a694f (amdgpu DDX & modesetting)
RX 560

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